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| Power Factor Correction and Servers |
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| Marco:
Had to do with corrosion at this point, POTS is long dead and servers are an entirely different market. The moment -48V leaves the insulated copper wires it's DC-DC'd to positive voltage rails, it can't provide impressed current cathodic protection for anything relevant for servers. |
| Bobson:
--- Quote from: Marco on August 21, 2022, 03:50:45 am ---POTS is long dead and servers are an entirely different market. --- End quote --- Not always. NEBS compliant servers/routers/switches have POTS legacy. Also, telcos consume very high share of servers. |
| NiHaoMike:
In the interest of prolonging the life of existing lines, wouldn't it make sense to have a protocol where the customer end equipment tells the ISP that it's self powered and no DC bias is required, keeping it that way as long as there's still an active link? There also exists a standard for supplying power from the customer end to the ISP, in order to improve resilience to natural disasters. https://www.microchip.com/en-us/products/power-management/reverse-power-feed-rpf |
| Red Squirrel:
POTS is still highly used, but I'd say we're kind of in the transition phase. There is no reason to roll out new POTS but also no reason to pull out existing that still works. What ends up happening is even the newer CO equipment that powers fibre optic, cellular etc is designed to run on -48v because that's what the power plant in the CO is setup as. I think there is also a DC standard for data centres that is in the 100's of volts. I could see telecom eventually switch to that once POTS is out since 48v is expensive in copper. 000000 cable is not uncommon within the building. The price of copper now days makes new runs of that stuff pretty much unfeasible. The cables were originally installed at a time when copper was cheap. |
| asis:
Hi, This is most likely due to the problem of some UPSs going into current protection at the moment the power supply of the server or several servers is turned on at once, since transients in PS with PFC create large currents at the moment of turning on. Moreover, if a switch to a diesel generator is made, PFC can play a cruel joke. The change in the sinusoidal shape of the input voltage forced all manufacturers to use switching power supply with PFC. Here are some highlights of how PFC works. |
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